projects / OpenSPARC-T2-SAM / blame
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| 128 | .rm #[ #] #H #V #F C | |
| 129 | .\" ======================================================================== | |
| 130 | .\" | |
| 131 | .IX Title "Fcntl 3" | |
| 132 | .TH Fcntl 3 "2001-09-21" "perl v5.8.8" "Perl Programmers Reference Guide" | |
| 133 | .SH "NAME" | |
| 134 | Fcntl \- load the C Fcntl.h defines | |
| 135 | .SH "SYNOPSIS" | |
| 136 | .IX Header "SYNOPSIS" | |
| 137 | .Vb 2 | |
| 138 | \& use Fcntl; | |
| 139 | \& use Fcntl qw(:DEFAULT :flock); | |
| 140 | .Ve | |
| 141 | .SH "DESCRIPTION" | |
| 142 | .IX Header "DESCRIPTION" | |
| 143 | This module is just a translation of the C \fIfcntl.h\fR file. | |
| 144 | Unlike the old mechanism of requiring a translated \fIfcntl.ph\fR | |
| 145 | file, this uses the \fBh2xs\fR program (see the Perl source distribution) | |
| 146 | and your native C compiler. This means that it has a | |
| 147 | far more likely chance of getting the numbers right. | |
| 148 | .SH "NOTE" | |
| 149 | .IX Header "NOTE" | |
| 150 | Only \f(CW\*(C`#define\*(C'\fR symbols get translated; you must still correctly | |
| 151 | pack up your own arguments to pass as args for locking functions, etc. | |
| 152 | .SH "EXPORTED SYMBOLS" | |
| 153 | .IX Header "EXPORTED SYMBOLS" | |
| 154 | By default your system's F_* and O_* constants (eg, F_DUPFD and | |
| 155 | O_CREAT) and the \s-1FD_CLOEXEC\s0 constant are exported into your namespace. | |
| 156 | .PP | |
| 157 | You can request that the \fIflock()\fR constants (\s-1LOCK_SH\s0, \s-1LOCK_EX\s0, \s-1LOCK_NB\s0 | |
| 158 | and \s-1LOCK_UN\s0) be provided by using the tag \f(CW\*(C`:flock\*(C'\fR. See Exporter. | |
| 159 | .PP | |
| 160 | You can request that the old constants (\s-1FAPPEND\s0, \s-1FASYNC\s0, \s-1FCREAT\s0, | |
| 161 | \&\s-1FDEFER\s0, \s-1FEXCL\s0, \s-1FNDELAY\s0, \s-1FNONBLOCK\s0, \s-1FSYNC\s0, \s-1FTRUNC\s0) be provided for | |
| 162 | compatibility reasons by using the tag \f(CW\*(C`:Fcompat\*(C'\fR. For new | |
| 163 | applications the newer versions of these constants are suggested | |
| 164 | (O_APPEND, O_ASYNC, O_CREAT, O_DEFER, O_EXCL, O_NDELAY, O_NONBLOCK, | |
| 165 | O_SYNC, O_TRUNC). | |
| 166 | .PP | |
| 167 | For ease of use also the SEEK_* constants (for \fIseek()\fR and \fIsysseek()\fR, | |
| 168 | e.g. \s-1SEEK_END\s0) and the S_I* constants (for \fIchmod()\fR and \fIstat()\fR) are | |
| 169 | available for import. They can be imported either separately or using | |
| 170 | the tags \f(CW\*(C`:seek\*(C'\fR and \f(CW\*(C`:mode\*(C'\fR. | |
| 171 | .PP | |
| 172 | Please refer to your native \fIfcntl\fR\|(2), \fIopen\fR\|(2), \fIfseek\fR\|(3), \fIlseek\fR\|(2) | |
| 173 | (equal to Perl's \fIseek()\fR and \fIsysseek()\fR, respectively), and \fIchmod\fR\|(2) | |
| 174 | documentation to see what constants are implemented in your system. | |
| 175 | .PP | |
| 176 | See perlopentut to learn about the uses of the O_* constants | |
| 177 | with \fIsysopen()\fR. | |
| 178 | .PP | |
| 179 | See \*(L"seek\*(R" in perlfunc and \*(L"sysseek\*(R" in perlfunc about the SEEK_* constants. | |
| 180 | .PP | |
| 181 | See \*(L"stat\*(R" in perlfunc about the S_I* constants. |